Wife Rika finds lipstick marks on her husband's Y-shirt when he comes home late at night. Unable to suppress her anxiety, Rika picks up her husband's cell phone and learns of Reiko, who works at the same place as her husband. Having made up her mind, Rika heads to her husband's office where she meets Reiko. However, Reiko was not surprised, and she touched Rika's body as if she had been waiting. Rika can't resist being mixed with an aphrodisiac in the tea served to her. Reiko's real purpose, which she thought was her husband's affair partner, was Rika from the beginning.
